The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 13, 2022
Filed:
Nov. 21, 2019
Panasonic Intellectual Property Management Co., Ltd., Osaka, JP;
Naoya Ryoki, Osaka, JP;
Kentaro Miyano, Osaka, JP;
Masaki Nobuoka, Nara, JP;
Akihiko Ishibashi, Osaka, JP;
Abstract
A RAMOsubstrate that does not easily crack during or after the formation of group III nitride crystal includes a single crystal represented by general formula RAMO(wherein R represents one or more trivalent elements selected from the group consisting of Sc, In, Y, and lanthanoid elements, A represents one or more trivalent elements selected from the group consisting of Fe(III), Ga, and Al, and M represents one or more divalent elements selected from the group consisting of Mg, Mn, Fe(II), Co, Cu, Zn, and Cd). The RAMOsubstrate has a crystal plane with a curvature radius r of 52 m or more, and a square value of correlation coefficient ρ of 0.81 or more. The curvature radius r is calculated as an absolute value from X-ray peak position ωi and measurement position Xi after the measurements of X-ray peak positions ωi at a plurality of positions Xi lying on a straight line passing through the center of the RAMOsubstrate. The correlation coefficient ρ is a measure of correlation between ω and measurement position Xi.